3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump($_SERVER['HTTP_HOST']);
Output for 5.3.0 - 5.6.30, hhvm-3.10.1 - 3.17.3, 7.0.0 - 7.2.0
Notice: Undefined index: HTTP_HOST in /in/TWZGL on line 2 NULL
Output for 4.3.0 - 5.2.17
Notice: Undefined index: HTTP_HOST in /in/TWZGL on line 2 NULL